We just used the interphone system on a 2100 mi trip, bike to bike, and have to say they worked fantastically! I did not think I would like the mono speaker but it really worked nicely. I installed mine on the right side of a helmet and hers on the left for a more direct line of sight (i generally ride front left) They worked as promissed, up to around 600 feet without distortion. The only problem is the battery life is about 5 hours but at $200. for two, we may get two more as our riding days are about 10 hrs.
I can't say enough about Blue Ant's costumer service. When we received the units, one was defective. They were in the process of moving their warehouse and had no units available. I told them we were leaving on a trip in 1 week and was told to call back in 4 days. Upon calling, they had just set one aside and overnighted it to us. Even told me to keep the defective unit, charger and headset for spare parts. No sending in the old unit and waiting days/weeks for a replacement! Great Co to deal with!